First off, let me say that I find the term "dead tree" to be pejorative, so I object to its use. Why not use "spent electrons" while you are at it?
Now, to answer your question, I prefer books. Something I can hold in my hand wherever I go, even during a power outage. If I happen to get a pdf I will more often then not print it out, bind it, and store the pdf on a CD-ROM somewhere.
I do not like sitting in front of a computer to read my game books. I do not like having computers at the gaming table. Maybe it is just because I started gaming when computers were as big as a table, or maybe it is because I find using a computer at the table puts a barrier between GM and player.
So, unless it is not available in print, I will take a book any day over "spent electrons".
Now, to answer your question, I prefer books. Something I can hold in my hand wherever I go, even during a power outage. If I happen to get a pdf I will more often then not print it out, bind it, and store the pdf on a CD-ROM somewhere.
I do not like sitting in front of a computer to read my game books. I do not like having computers at the gaming table. Maybe it is just because I started gaming when computers were as big as a table, or maybe it is because I find using a computer at the table puts a barrier between GM and player.
So, unless it is not available in print, I will take a book any day over "spent electrons".